Hi Harmony
Yes - sponges all in at the same time. Would need to check back my diary to be sure but I think I took sponges out of first two and they went in after 36 hrs, and there was a day between each. I know a ram lamb could probably have coped with six but was worried he would latch on to a couple of the most tarty ones (two spring to mind!) and might miss one out lol. Worked well anyway.
Foobar - like the pen idea
This year thinking all in at 36 hrs